They’ll reach the top first - in seconds (7-2)

I believe the answer is:

runners-up

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'seconds' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for runners-up that I've seen before include "Those who come second" , "Those finishing second" , "Those not quite winning" , "Those placed second" , "Those in second place" .)

I've seen this clue in the Evening Standard.

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